Campaign finance

Democratic presidential candidate former Vice President Joe Biden speaks at Alexis Dupont High School in Wilmington, Del., on June 30, 2020. As his bid for a second term faces growing obstacles, President Donald Trump’s primacy in the dizzying digital world is one of his top advantages, giving him a massive platform to connect with supporters and push a message that ignores his vulnerabilities related to the pandemic, unemployment and race relations. Biden and his allies are working feverishly to establish a social media force of their own. (AP Photo/Patrick Semansky)

FILE - In this June 20, 2020, file photo, Geoffrey S. Berman, then-U.S. attorney for the Southern District of New York, speaks to reporters as he arrives to his office in New York. The ousted former U.S. attorney for Manhattan will sit down with the House Judiciary Committee next week for a closed-door interview as the panel investigates politicization in the Justice Department (AP Photo/Kevin Hagen, File)

Democratic presidential candidate, former Vice President Joe Biden departs after speaking at Alexis Dupont High School in Wilmington, Del., Tuesday, June 30, 2020. (AP Photo/Patrick Semansky)

FILE - In this Nov. 6, 2018, file photo, Amy McGrath speaks to supporters in Richmond, Ky. McGrath overcame a bumpier-than-expected Kentucky primary to win the Democratic U.S. Senate nomination Tuesday, June 30, 2020 fending off progressive Charles Booker to set up a bruising, big-spending showdown with Republican Senate Majority Leader Mitch McConnell. (AP Photo/Bryan Woolston, File)

In this Nov. 4, 2016, photo, Nebraska Democratic Party chairwoman Jane Kleeb is about to introduce Sen. Bernie Sanders, I-Vt., during a rally for Democratic presidential candidate Hillary Clinton, in Omaha, Neb. Kleeb published a book in 2020 about how her party could return from relative irrelevance in rural America and once again win elections, but the last few months have shown just how difficult that task can be. (AP Photo/Nati Harnik)

FILE - In this June 23, 2020, file photo, a car passes a yard displaying a campaign sign for Democratic presidential candidate, former Vice President Joe Biden in North Hampton, New Hampshire. The coronavirus pandemic isn't going away anytime soon, but campaigns are still forging ahead with in-person organizing. The pandemic upended elections this year, forcing campaigns to shift their organizing activities almost entirely online and compelling both parties to reconfigure their conventions. (AP Photo/Charles Krupa, File)

President Donald Trump speaks during a news conference with Polish President Andrzej Duda in the Rose Garden of the White House, Wednesday, June 24, 2020, in Washington. (AP Photo/Evan Vucci)

Geoffrey S. Berman, United States attorney for the Southern District of New York, arrives to his office in New York on Saturday, June 20, 2020. The Justice Department moved abruptly Friday night to oust Berman, the U.S. attorney in Manhattan overseeing key prosecutions of President Donald Trump’s allies and an investigation of his personal lawyer Rudy Giuliani. But Berman said he was refusing to leave his post and his ongoing investigations would continue. (AP Photo/Kevin Hagen)

Geoffrey S. Berman, United States attorney for the Southern District of New York, arrives to his office in New York on Saturday, June 20, 2020. The Justice Department moved abruptly Friday night to oust Berman, the U.S. attorney in Manhattan overseeing key prosecutions of President Donald Trump’s allies and an investigation of his personal lawyer Rudy Giuliani. But Berman said he was refusing to leave his post and his ongoing investigations would continue. (AP Photo/Kevin Hagen)

FILE - In this Oct. 26, 2018, file photo, Geoffrey Berman, U.S. attorney for the Southern District of New York, speaks during a news conference at the Department of Justice in Washington. The Justice Department moved abruptly Friday, June 19, 2020, to oust Berman, the U.S. attorney in Manhattan overseeing key prosecutions of President Donald Trump’s allies and an investigation of his personal lawyer Rudy Giuliani. But Berman said he was refusing to leave his post and his ongoing investigations would continue. (AP Photo/Alex Brandon, File)